/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.context.index.processor;

import java.util.LinkedHashSet;
import java.util.Set;

import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.Element;
import javax.lang.model.element.ElementKind;

/**
 * A {@link StereotypesProvider} that extract a stereotype for each
 * {@code javax.*} annotation placed on a class or interface.
 *
 * @author Stephane Nicoll
 * @since 5.0
 */
class StandardStereotypesProvider implements StereotypesProvider {

    private final TypeHelper typeHelper;


    StandardStereotypesProvider(TypeHelper typeHelper) {
        this.typeHelper = typeHelper;
    }


    @Override
    public Set<String> getStereotypes(Element element) {
        Set<String> stereotypes = new LinkedHashSet<>();
        ElementKind kind = element.getKind();
        if (kind != ElementKind.CLASS && kind != ElementKind.INTERFACE) {
            return stereotypes;
        }
        for (AnnotationMirror annotation : this.typeHelper.getAllAnnotationMirrors(element)) {
            String type = this.typeHelper.getType(annotation);
            if (type.startsWith("javax.")) {
                stereotypes.add(type);
            }
        }
        return stereotypes;
    }

}
